Tube coupling



Dec- 6, 1932 G. A. MONTGOMERY 1,889,869

TUBE GOUPLING Filed Aug. 2. 1930 c mm Patented Dec. 6; 1.932

UNITED STATES PATENT oFFlcE GUSTAVUS A. MONTGOMERY, F DALLAS, TEXAS TUBE courrant;

Application med August 2i, i930. serial No. 472,544.

5 perienced during drilling operations.

An .object of the invention is to provide 'a' pipe joint having individual sealing members for each of a pair of pin ends which are 10.said sealing members resting on a common flange which divides them to preclude the possibility of an unscrewing of one of the in ends being communicated to the other sealing member and its complementallpin end.

A further object of the invention is to provide a sealing member consisting cfa yieldable bellows with rings at its oppositer ends. said rings being of substantially the same diameter but respectively being loose and relatively tight in the bore of a coupling sleeve by virtue of being spaced from a certain llet and being fitted in another fillet which is adjacent to a flange by which the res ective ring is supported. 0

further object ofthe invention is .to deine an annular cavity by means of the foregoing llets, said cavity containing a filling of composition which surrounds t e sealing member, the arrangement being such that the filling is capable of being extruded from s aid cavity past one of the rings of the sealing member toward the pin end of a pipe section screwed into the coupling sleeve.

The device is an improvement upon the structure disclosed in my co-pending application No. 373,356 filed June 24-, 1929.

In the drawing herewith Fig. 1 is a central longitudinal section through a coupling enibodying myinvention.

Fig. 2 is an end elevation of my resilient sleeve.

Fig. 3 is -a longitudinal section through my sealing member. y

Fig. 4 is a longitudinal section through my filler or packing ring.

Fig. 5 is a section through another filler ring made in only one stage.

Fig. 6 is an end view of tlieviller ring.

In carrying out my invention I employ a coupling sleeve 1, the ends of which are screwed into the boxes of a coupling sleeve,l

formed with coarsely threaded boxes 2 to receive the ends of pipe sections 3. I form no shoulders on the pipesections -to limit the screwing up of the joints. Midway of the ends of the bore of the coupling 1 is an in- 55 wardly projecting flange 4 to act as an abutment, as will be later explained. Each portion of the bore has fillets 4', 4h respectively adJacent to the `flange 4 and the threaded boxes 2. 'v 60 Between the pipe ends and the shoulders 5 on each side ofthe flange 4 are spring sleeves A which include end rings 6 and connecting bellows'shaped spring members 7. the so-called spring sleeves and spring meinbers being generall denoted a bellows. These ringsare of substantially the same diameter. It will be seen that the sleeves are fluid tightbetween their ends, yet they may be resiliently compressed longitudinally. 7 The rings 6 have grooves formed in their end faces' to receive packing elements 8 of soft metal such as copper, to forma seal with the ends of the. pipe sections andthe shoulders upon the flange 4. 75 The wall of the coupling is recessed or counterbored slightly at 9 to form an annular cavity to receive filler rings or inserts l0 of rubber or similar compressible and elastic composition formed with ridges on their inner faces to it within the convolutions of the spring member 7, said' cavity being particularly defined by the aforegoing fillets 4", 4". The bore of the coupling sleeve is'of a greater diameter than that of the rings 6, and when one of the rings is inserted inthe fillet 4a inv a supported position on the iange 4 it makes a relatively tight tit, while the other ring which is abutted by the respective pin endv is relatively loose, there being an annular space between it and the fillet 4b. The outer periphery of the filler ring is cylindrical to tit within-the cavity 9. `It is contemplated that these rings 1() will be under 95 compression and thus form a tight sealing tit in the coupling, the substance of said filler rings being subject to extrusion through the annular spaces adjacent to the fillets 4". Said rings may consist of one stage or section as 10o thereby roviding a s ace around theabutted 'joint -isisuliiciently tight." A seal Vvwill bey..

made with lthe rings .8 .in the end of the' sleeves, so that there will be no leakage.. Thefiller rings 10 will lalso ltend-to maintain-a"v seal and will Vfrictionally engage the walls ofthe coupling to mantamthe sleeves position. Thesespringsalso reinforce the spring members andv resistA strains tending [to` rupture the-sleeve. u y j The rings 6f bear'frictionally against. theendsof the' pipe sections 3 and resist anytendency of the coupling to unscrew inuse, theparticular purpose of the flange'4 being `to separate the sealing members so that an untransmittedto' the other pin end. Where a slight unscrewing doesltake"place,"the expansion of the spring will vstill maintain frictional engagement withthe end ofthe and maintain a seal therewith.'-

What I vclaim'a's 4new is :v 1.: Aa 'pipe joint for d ill a sealing -member consistingof a bellowsV an rings at the ends of the bellows, said. ringsl fbeingsubstantially, ofthe same diameter, a j

coupling having a threaded socket to receive a pipe section for abutting one ofthe rings stems comprising 5 said fillets defining of end rings one of which is tightly tted 1n` the fillet next to the flange the other loosely occupying `the `lillet next to the threaded,V vsocket to leave an annular s ace, a bellows connecting the rings, anda lil mg of composian annular cavity a pair i tio'nfnormall occupying the annular cavity between-the lets.

a tubularA coupling having threaded I boxes at each end, pins screwed into .the boxes,

and a radial flange in the bore of said cou- 7p1ing;.a sleeve oneach side of said flange to receive the endthrust of the respective pinl end, -said -sleeves being` circumferentially `.corrugated to make' them longitiidin'allyLre-` silient for limited yielding under sa'id1 end and inserts -of elastic `material betweenv sai tinoV Within said-corrugatedportions.

pipev Suid Socket merging into a c umhical bore o adiameter greater than't atof theirings thereby Providing a space around the abutted i I. l i

support for theother ring, saidbore having al illeta'dj acent to the flange in which said other ring has a relatively tight fit.

i2-FAPPQ'IOII.'I '1I1s :om'prisina sealing member consisting of a bellows an a pipe'section for abutting'one of the'rings said socket merging into a c lindrical bore o a dlameter greater than -t at ofjthe rings `rng, a ange-in'sai lbore, providing asuport 'forithe-other ring, said borehavinga et' adjacent lto the flange which said pipe sect1l '011.

3. Atubular pipe joint for drill stems including a'couplmg having a cylindrical bore `and a threaded socket atoneend to receive the pipe section, a flange in said bore, fillets andthe inv sal bore, one being adjacent to the flange at the ends fthebnows', saidfngs bem substantiallyof the same diameter, a coup ng having a threaded socketto receive otheriadjacent'tothe threaded socket, A

, thrust, rings at .the-terminals of saidrsle'e've's :sleeves andthe bore of said coupling-:and t- I n-testimony whereof, I hereunto my I. `signature, this the 14th `day ofv July DL,

screwing tendency 'of one pin end-cannot be 193 i j -GUsfrAvUs. A. -MoN'lGoMnnv--- i 

